Oh, I've seen those. I mean how he looked right before shaving his head. I just want to see if he was starting to become bald and then decided to "fuck it!" and shave his whole head or if he had normal hair but just wanted to change style or something.

Yeah Matsumoto just suddenly decided he'd shave it one day. He'd been idolized by fangirls with his previous look, perhaps he grew tired of that later in his career. That's just a guess though. But similarly Housei started to wear suits later in his career vs casual wear for a change of image (except in shows that are primarily casual dress like Gaki, travel shows etc.).